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linux/include/trace/events
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Goldwyn Rodrigues 7a97f961a5 btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref 
[ Upstream commit bc7e097509 ]

btrfs_prelim_ref() calls the old and new reference variables in the
incorrect order. This causes a NULL pointer dereference because oldref
is passed as NULL to trace_btrfs_prelim_ref_insert().

Note, trace_btrfs_prelim_ref_insert() is being called with newref as
oldref (and oldref as NULL) on purpose in order to print out
the values of newref.

To reproduce:
echo 1 > /sys/kernel/debug/tracing/events/btrfs/btrfs_prelim_ref_insert/enable

Perform some writeback operations.

Backtrace:
BUG: kernel NULL pointer dereference, address: 0000000000000018
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 115949067 P4D 115949067 PUD 11594a067 PMD 0
 Oops: Oops: 0000 [#1] SMP NOPTI
 CPU: 1 UID: 0 PID: 1188 Comm: fsstress Not tainted 6.15.0-rc2-tester+ #47 PREEMPT(voluntary)  7ca2cef72d5e9c600f0c7718adb6462de8149622
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014
 RIP: 0010:trace_event_raw_event_btrfs__prelim_ref+0x72/0x130
 Code: e8 43 81 9f ff 48 85 c0 74 78 4d 85 e4 0f 84 8f 00 00 00 49 8b 94 24 c0 06 00 00 48 8b 0a 48 89 48 08 48 8b 52 08 48 89 50 10 <49> 8b 55 18 48 89 50 18 49 8b 55 20 48 89 50 20 41 0f b6 55 28 88
 RSP: 0018:ffffce44820077a0 EFLAGS: 00010286
 RAX: ffff8c6b403f9014 RBX: ffff8c6b55825730 RCX: 304994edf9cf506b
 RDX: d8b11eb7f0fdb699 RSI: ffff8c6b403f9010 RDI: ffff8c6b403f9010
 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000010
 R10: 00000000ffffffff R11: 0000000000000000 R12: ffff8c6b4e8fb000
 R13: 0000000000000000 R14: ffffce44820077a8 R15: ffff8c6b4abd1540
 FS:  00007f4dc6813740(0000) GS:ffff8c6c1d378000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000018 CR3: 000000010eb42000 CR4: 0000000000750ef0
 PKRU: 55555554
 Call Trace:
  <TASK>
  prelim_ref_insert+0x1c1/0x270
  find_parent_nodes+0x12a6/0x1ee0
  ? __entry_text_end+0x101f06/0x101f09
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  ? srso_alias_return_thunk+0x5/0xfbef5
  btrfs_is_data_extent_shared+0x167/0x640
  ? fiemap_process_hole+0xd0/0x2c0
  extent_fiemap+0xa5c/0xbc0
  ? __entry_text_end+0x101f05/0x101f09
  btrfs_fiemap+0x7e/0xd0
  do_vfs_ioctl+0x425/0x9d0
  __x64_sys_ioctl+0x75/0xc0

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-04 14:42:16 +02:00
..
9p.h 9p: prevent read overrun in protocol dump tracepoint 2024-01-01 12:42:43 +00:00
afs.h afs: Fix cleanup of immediately failed async calls 2025-02-08 09:51:42 +01:00
alarmtimer.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
asoc.h ASoC: tracing: Export SND_SOC_DAPM_DIR_OUT to its value 2024-06-12 11:12:03 +02:00
avc.h selinux: add basic filtering for audit trace events 2020-08-21 17:07:29 -04:00
bcache.h block: remove superfluous param in blk_fill_rwbs() 2021-02-22 06:37:41 -07:00
block.h fs: add CONFIG_BUFFER_HEAD 2023-08-02 09:13:09 -06:00
bpf_test_run.h selftests: bpf: test writable buffers in raw tps 2019-04-26 19:04:19 -07:00
bridge.h net: bridge: Add a tracepoint for MDB overflows 2023-02-06 08:48:25 +00:00
btrfs.h btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref 2025-06-04 14:42:16 +02:00
cachefiles.h cachefiles: fix slab-use-after-free in cachefiles_ondemand_daemon_read() 2024-06-21 14:38:27 +02:00
cgroup.h cgroup: Trace event cgroup id fields should be u64 2021-12-01 07:23:35 -10:00
clk.h clk: Add trace events for rate requests 2022-12-07 13:54:09 -08:00
cma.h trace: cma: remove unnecessary event class cma_alloc_class 2023-04-05 19:42:58 -07:00
compaction.h mm: compaction: add trace event for fast freepages isolation 2023-06-09 16:25:43 -07:00
context_tracking.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpuhp.h treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively 2019-04-09 14:19:06 +02:00
csd.h trace,smp: Add tracepoints for scheduling remotelly called functions 2023-06-16 22:08:09 +02:00
damon.h mm/damon: hide kernel pointer from tracepoint event 2022-01-15 16:30:33 +02:00
devfreq.h PM / devfreq: Add tracepoint for frequency changes 2020-10-26 10:52:37 +09:00
devlink.h devlink: Fix TP_STRUCT_entry in trace of devlink health report 2023-02-15 19:15:44 -08:00
dlm.h fs: dlm: add plock dev tracepoints 2023-08-10 10:33:03 -05:00
dma_fence.h treewide: Add missing semicolons to __assign_str uses 2021-06-30 09:19:14 -04:00
erofs.h erofs: adapt folios for z_erofs_read_folio() 2023-08-23 23:47:33 +08:00
error_report.h panic: use error_report_end tracepoint on warnings 2022-01-20 08:52:55 +02:00
ext4.h ext4: Give symbolic names to mballoc criterias 2023-06-26 19:34:56 -04:00
f2fs.h f2fs: reduce expensive checkpoint trigger frequency 2024-10-04 16:29:36 +02:00
fib.h net: Replace strlcpy with strscpy 2023-07-04 19:40:16 +01:00
fib6.h net: Replace strlcpy with strscpy 2023-07-04 19:40:16 +01:00
filelock.h locks: Remove extra "0x" in tracepoint format specifier 2020-09-01 18:09:34 -04:00
filemap.h filemap: Convert tracing of page cache operations to folio 2022-01-04 13:15:33 -05:00
fs_dax.h libnvdimm for 4.15 2017-11-17 09:51:57 -08:00
fscache.h cachefiles: fix slab-use-after-free in fscache_withdraw_volume() 2024-07-25 09:50:57 +02:00
fsi.h fsi: core: Add trace events for scan and unregister 2023-08-09 15:43:28 +09:30
fsi_master_aspeed.h fsi: Add trace events in initialization path 2022-02-21 19:38:54 +10:30
fsi_master_ast_cf.h fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire 2018-07-23 15:22:52 +10:00
fsi_master_gpio.h fsi: master-gpio: Add more tracepoints 2018-07-12 12:02:31 +10:00
fsi_master_i2cr.h fsi: Add IBM I2C Responder virtual FSI master 2023-08-11 13:32:14 +09:30
gpio.h tracing: stop making gpio tracing configurable 2019-04-08 15:11:48 +02:00
gpu_mem.h gpu/trace: Minor comment updates for gpu_mem_total tracepoint 2020-05-07 13:32:57 -04:00
habanalabs.h habanalabs: define events to trace PCI LBW access 2023-01-26 11:52:11 +02:00
handshake.h net/handshake: Trace events for TLS Alert helpers 2023-07-28 14:07:59 -07:00
host1x.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
huge_memory.h mm: khugepaged: fix the arguments order in khugepaged_collapse_file trace point 2024-11-01 01:58:26 +01:00
hwmon.h hwmon: (core) Add trace events to _attr_show/store functions 2018-10-11 20:07:35 -07:00
i2c.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
i2c_slave.h i2c: add tracepoints for I2C slave events 2022-03-20 00:11:05 +01:00
ib_mad.h IB/mad: Don't call to function that might sleep while in atomic context 2022-11-10 10:57:15 +02:00
ib_umad.h IB/UMAD: Add umad trace points 2019-03-27 15:52:01 -03:00
icmp.h net/ipv4: add tracepoint for icmp_send 2025-03-07 16:45:39 +01:00
initcall.h tracing: initcall: Ordered comparison of function pointers 2018-04-26 15:02:46 -04:00
intel-sst.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
intel_ifs.h platform/x86/intel/ifs: Gen2 Scan test support 2024-08-14 13:58:37 +02:00
intel_ish.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io_uring.h io_uring: rename trace_io_uring_submit_sqe() tracepoint 2023-04-03 07:16:15 -06:00
iocost.h blk-iocost: Trace vtime_base_rate instead of vtime_rate 2022-12-01 07:44:12 -07:00
iommu.h iommu: Remove detach_dev callback 2023-01-13 16:39:18 +01:00
ipi.h trace: Add trace_ipi_send_cpu() 2023-03-24 11:01:29 +01:00
irq.h softirq: Add trace points for tasklet entry/exit 2023-04-15 10:17:16 +02:00
irq_matrix.h genirq/matrix: Add tracepoints 2017-09-25 20:38:26 +02:00
iscsi.h scsi: iscsi: tracing: Use the new __vstring() helper 2022-07-19 11:20:25 -04:00
jbd2.h jbd2: remove journal_clean_one_cp_list() 2023-07-10 23:09:21 -04:00
kmem.h mm: convert mm's rss stats into percpu_counter 2022-11-30 15:58:40 -08:00
ksm.h mm: add tracepoints to ksm 2023-03-28 16:20:08 -07:00
kvm.h KVM: x86/mmu: rename trace function name for asynchronous page fault 2022-08-10 15:08:26 -04:00
kyber.h kyber: Replace strlcpy with strscpy 2023-07-17 08:18:17 -06:00
libata.h ata: libata: add qc->flags in ata_qc_complete_template tracepoint 2022-06-17 16:30:03 +09:00
lock.h locking/mutex: Make contention tracepoints more consistent wrt adaptive spinning 2022-04-05 10:24:36 +02:00
maple_tree.h Maple Tree: add new data structure 2022-09-26 19:46:13 -07:00
mce.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mctp.h mctp: Add SIOCMCTP{ALLOC,DROP}TAG ioctls for tag control 2022-02-09 12:00:11 +00:00
mdio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
migrate.h mm/migration: add trace events for base page and HugeTLB migrations 2022-03-24 19:06:45 -07:00
mlxsw.h mlxsw: spectrum_acl: Rename rehash_dis trace 2019-03-31 11:01:23 -07:00
mmap.h mm: mmap: remove newline at the end of the trace 2023-03-23 17:18:36 -07:00
mmap_lock.h mm: mmap_lock: use DECLARE_EVENT_CLASS and DEFINE_EVENT_FN 2021-11-06 13:30:36 -07:00
mmc.h mmc: core: Fix tracepoint print of blk_addr and blksz 2018-03-15 11:15:22 +01:00
mmflags.h mm: turn folio_test_hugetlb into a PageType 2024-05-02 16:32:47 +02:00
module.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mptcp.h mptcp: sched: check both directions for backup 2024-08-11 12:47:25 +02:00
napi.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
nbd.h nbd: add tracepoints for send/receive timing 2019-04-26 19:04:19 -07:00
neigh.h neighbor: tracing: Move pin6 inside CONFIG_IPV6=y section 2023-10-18 11:16:43 +01:00
net.h net: fix net_dev_start_xmit trace event vs skb_transport_offset() 2023-07-03 09:13:23 +01:00
net_probe_common.h net: dccp: Add DCCP sendmsg trace event 2018-01-02 14:27:30 -05:00
netfs.h netfs: Add a function to consolidate beginning a read 2022-03-18 09:29:05 +00:00
netlink.h netlink: add tracepoint at NL_SET_ERR_MSG 2021-02-04 18:05:59 -08:00
nilfs2.h fs/nilfs2: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:33 -06:00
nmi.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
notifier.h notifiers: add tracepoints to the notifiers infrastructure 2023-04-08 13:45:38 -07:00
objagg.h lib: introduce initial implementation of object aggregation manager 2018-11-15 14:43:43 -08:00
oom.h mm: update mark_victim tracepoints fields 2025-02-27 04:10:45 -08:00
osnoise.h tracing: Fix spelling in osnoise tracer "interferences" -> "interference" 2021-06-28 14:12:27 -04:00
page_isolation.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page_pool.h page_pool: split types and declarations from page_pool.h 2023-08-07 13:05:19 -07:00
page_ref.h mm: introduce PAGEFLAGS_MASK to replace ((1UL << NR_PAGEFLAGS) - 1) 2021-09-08 11:50:24 -07:00
pagemap.h mm/lru: Convert __pagevec_lru_add_fn to take a folio 2021-10-18 07:49:40 -04:00
percpu.h include/trace/events/percpu.h: cleanup for "percpu: improve percpu_alloc_percpu event trace" 2022-05-25 10:47:48 -07:00
power.h cpuidle: Add cpu_idle_miss trace event 2022-08-03 17:50:58 +02:00
power_cpu_migrate.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
preemptirq.h tracing: Change offset type to s32 in preempt/irq tracepoints 2020-01-03 11:34:37 -05:00
printk.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pwc.h media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler() 2019-01-16 11:15:11 -05:00
pwm.h pwm/tracing: Also record trace events for failed API calls 2022-12-06 12:46:23 +01:00
qdisc.h tracing/net_sched: NULL pointer dereference in perf_trace_qdisc_reset() 2024-07-05 09:34:07 +02:00
qla.h scsi: qla2xxx: tracing: Use the new __vstring() helper 2022-07-19 11:20:25 -04:00
qrtr.h net: qrtr: correct types of trace event parameters 2023-04-04 18:58:43 -07:00
rcu.h RCU Changes for 6.4: 2023-04-24 12:16:14 -07:00
rdma_core.h RDMA/core: Add trace points to follow MR allocation 2020-01-07 16:10:53 -04:00
regulator.h regulator: core: Add regulator bypass trace points 2020-05-29 17:17:02 +01:00
rpcgss.h SUNRPC: Fixup gss_status tracepoint error output 2024-08-03 08:53:55 +02:00
rpcrdma.h svcrdma: trace cc_release calls 2023-06-17 13:18:06 -04:00
rpm.h PM-runtime: add tracepoints for usage_count changes 2020-01-13 12:28:29 +01:00
rseq.h tracing/rseq: Add mm_cid field to rseq_update 2022-12-27 12:52:15 +01:00
rtc.h rtc: Add tracepoints for RTC system 2018-02-13 21:30:22 +01:00
rv.h rv/monitor: Add the wwnr monitor 2022-07-30 14:01:30 -04:00
rwmmio.h asm-generic/io: Add _RET_IP_ to MMIO trace for more accurate debug info 2022-11-21 22:02:10 +01:00
rxrpc.h rxrpc: Fix the rxrpc_connection attend queue handling 2025-02-17 09:40:13 +01:00
sched.h sched: Remove vruntime from trace_sched_stat_runtime() 2024-12-14 20:00:19 +01:00
scmi.h include: trace: Add platform and channel instance references 2023-01-20 11:40:57 +00:00
scsi.h scsi: core: Trace SCSI sense data 2023-05-31 11:05:34 -04:00
sctp.h sctp: move trace_sctp_probe_path into sctp_outq_sack 2019-12-26 13:06:45 -08:00
signal.h signal: Distinguish between kernel_siginfo and siginfo 2018-10-03 16:47:43 +02:00
siox.h siox: add support for tracing 2017-12-19 10:56:24 +01:00
skb.h net: add location to trace_consume_skb() 2023-02-20 08:28:49 +00:00
smbus.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36 2019-05-24 17:27:11 +02:00
sock.h inet: preserve const qualifier in inet_sk() 2023-03-17 08:56:37 +00:00
sof.h ASoC: SOF: replace ipc4-loader dev_vdbg with tracepoints 2022-09-19 15:44:08 +01:00
sof_intel.h ASoC: SOF: Intel: replace dev_vdbg with tracepoints 2022-09-19 15:44:06 +01:00
spi.h spi: Fix spelling typos and acronyms capitalization 2023-07-11 14:14:32 +01:00
spmi.h spmi: trace: fix stack-out-of-bound access in SPMI tracing functions 2022-07-24 16:16:44 +02:00
sunrpc.h SUNRPC: Prevent looping due to rpc_signal_task() races 2025-03-07 16:45:36 +01:00
sunvnet.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
swiotlb.h swiotlb: make the swiotlb_init interface more useful 2022-04-18 07:21:11 +02:00
syscalls.h syscalls: Remove start and number from syscall_get_arguments() args 2019-04-05 09:26:43 -04:00
target.h scsi: target: core: Add CONTROL field for trace events 2020-10-02 18:36:19 -04:00
task.h tracing: Replace strlcpy with strscpy in trace/events/task.h 2023-09-01 21:00:00 -04:00
tcp.h tcp: add missing family to tcp_set_ca_state() tracepoint 2023-08-09 13:45:19 -07:00
tegra_apb_dma.h tracing: Fix header include guards in trace event headers 2019-07-30 21:49:06 -04:00
thermal_pressure.h arch_topology: Trace the update thermal pressure 2022-05-06 09:57:38 +02:00
thp.h powerpc/book3s64/mm: enable transparent pud hugepage 2023-08-18 10:12:55 -07:00
timer.h tracing/timer: Add missing hrtimer modes to decode_hrtimer_mode(). 2023-06-19 09:09:14 +02:00
tlb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
udp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ufs.h scsi: ufs: core: Add trace event for MCQ 2023-03-16 23:16:18 -04:00
v4l2.h media: v4l2: abstract timeval handling in v4l2_buffer 2020-01-03 15:43:35 +01:00
vb2.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmalloc.h mm: vmalloc: add free_vmap_area_noflush trace event 2022-11-08 17:37:17 -08:00
vmscan.h tracing: incorrect isolate_mote_t cast in mm_vmscan_lru_isolate 2022-05-19 14:08:55 -07:00
vsock_virtio_transport_common.h virtio/vsock: update trace event for SEQPACKET 2021-06-11 13:32:47 -07:00
watchdog.h watchdog: Add tracing events for the most usual watchdog events 2022-10-12 09:47:02 +02:00
wbt.h blk-wbt: Replace strlcpy with strscpy 2023-07-17 08:18:17 -06:00
workqueue.h workqueue: Fix type of cpu in trace event 2022-06-07 07:09:47 -10:00
writeback.h writeback: fix dereferencing NULL mapping->host on writeback_page_template 2023-06-19 13:19:31 -07:00
xdp.h net: invert the netdevice.h vs xdp.h dependency 2023-08-03 08:38:07 -07:00
xen.h x86/xen: move paravirt lazy code 2023-09-19 07:04:49 +02:00