bisecting fixing commit since daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b
building syzkaller on 5050311712ecf43945d306df4653fc28da89fb43
testing commit daefdc9eb24bfa11ab77a4b2a9c3923f1051fe0b
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 19324fa481d2b975089e05820e1c7d7b1819b3ae25104d52bc40833a5d4cd098
all runs: crashed: possible deadlock in __sock_release
testing current HEAD a89b48fe9308d976d9dcb2112e264d647f7efce4
testing commit a89b48fe9308d976d9dcb2112e264d647f7efce4
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6a07d37c0969a25e1d4442f3a17796eda45078a87a5862e9d193fe3826e844cb
run #0: OK
run #1: OK
run #2: crashed: BUG: sleeping function called from invalid context in lock_sock_nested
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
Reproducer flagged being flaky
revisions tested: 2, total time: 32m25.642068345s (build: 19m9.530022731s, test: 12m40.426244561s)
the crash still happens on HEAD
commit msg: Linux 4.19.199
crash: BUG: sleeping function called from invalid context in lock_sock_nested
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
BUG: sleeping function called from invalid context at net/core/sock.c:2863
in_atomic(): 1, irqs_disabled(): 0, pid: 9218, name: syz-executor.2
1 lock held by syz-executor.2/9218:
 #0: 000000000764a7ff (hci_sk_list.lock){++++}, at: hci_sock_dev_event+0x361/0x5e0 net/bluetooth/hci_sock.c:756
Preemption disabled at:
[<ffffffff86d92d71>] hci_sock_dev_event+0x361/0x5e0 net/bluetooth/hci_sock.c:756
CPU: 1 PID: 9218 Comm: syz-executor.2 Not tainted 4.19.199-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x17c/0x226 lib/dump_stack.c:118
 ___might_sleep.cold.15+0x1f1/0x265 kernel/sched/core.c:6192
 __might_sleep+0x95/0x190 kernel/sched/core.c:6145
 lock_sock_nested+0x24/0x100 net/core/sock.c:2863
 lock_sock include/net/sock.h:1510 [inline]
 hci_sock_dev_event+0x3e4/0x5e0 net/bluetooth/hci_sock.c:758
 hci_unregister_dev+0x20b/0x890 net/bluetooth/hci_core.c:3292
 vhci_release+0x6b/0xe0 drivers/bluetooth/hci_vhci.c:354
 __fput+0x249/0x7f0 fs/file_table.c:278
 ____fput+0x9/0x10 fs/file_table.c:309
 task_work_run+0x108/0x180 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xa6a/0x2d90 kernel/exit.c:870
 do_group_exit+0xf8/0x2c0 kernel/exit.c:967
 get_signal+0x30b/0x1970 kernel/signal.c:2589
 do_signal+0x87/0x1870 arch/x86/kernel/signal.c:799
 exit_to_usermode_loop+0x159/0x1e0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4657f9
Code: Bad RIP value.
RSP: 002b:00007f1210d38188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: fffffffffffffffc RBX: 000000000055bfa8 RCX: 00000000004657f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062040400
RBP: 00000000004af682 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bfa8
R13: 00007ffdaa11b82f R14: 00007f1210d38300 R15: 0000000000022000
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21