bisecting fixing commit since fc3abb53250a90ba2150eebd182137c136f4d25a building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit fc3abb53250a90ba2150eebd182137c136f4d25a with gcc (GCC) 8.4.1 20210217 kernel signature: 2d171b5e99cc1e86f328ad10335be5d24c0cdee9cf72ab9f90479e8592770217 run #0: crashed: BUG: workqueue lockup run #1: crashed: BUG: soft lockup in hci_cmd_timeout run #2: crashed: BUG: soft lockup in do_idle run #3: crashed: BUG: soft lockup in do_idle run #4: crashed: BUG: soft lockup in smp_call_function run #5: crashed: BUG: workqueue lockup run #6: crashed: BUG: soft lockup in tc_modify_qdisc run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: soft lockup in do_idle run #9: crashed: BUG: soft lockup in wb_workfn run #10: crashed: BUG: soft lockup in do_idle run #11: crashed: BUG: soft lockup in do_idle run #12: crashed: BUG: soft lockup in do_idle run #13: crashed: BUG: soft lockup in do_idle run #14: crashed: BUG: soft lockup in rtnl_newlink run #15: crashed: BUG: soft lockup in smp_call_function run #16: crashed: BUG: soft lockup in do_idle run #17: crashed: BUG: soft lockup in rtnl_newlink run #18: crashed: BUG: soft lockup in do_idle run #19: crashed: BUG: soft lockup in do_idle testing current HEAD c2131f7e73c9e9365613e323d65c7b9e5b910f56 testing commit c2131f7e73c9e9365613e323d65c7b9e5b910f56 with gcc (GCC) 10.2.1 20210217 kernel signature: 3e8770f3d249be73af7bff562446955525b67833d737802f93da67e49e312f26 run #0: crashed: BUG: soft lockup in do_idle run #1: crashed: BUG: soft lockup in tc_modify_qdisc run #2: crashed: BUG: soft lockup in do_symlinkat run #3: crashed: BUG: soft lockup in ext4_end_io_rsv_work run #4: crashed: BUG: soft lockup in hci_cmd_timeout run #5: crashed: BUG: soft lockup in do_idle run #6: crashed: BUG: soft lockup in do_idle run #7: crashed: BUG: soft lockup in do_idle run #8: crashed: BUG: soft lockup in linkwatch_event run #9: crashed: BUG: soft lockup in mutex_spin_on_owner revisions tested: 2, total time: 22m2.818962922s (build: 11m56.155234084s, test: 9m22.4028405s) the crash still happens on HEAD commit msg: Merge tag 'gfs2-v5.13-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2 crash: BUG: soft lockup in mutex_spin_on_owner watchdog: BUG: soft lockup - CPU#0 stuck for 68s! [syz-executor.2:7439] Modules linked in: irq event stamp: 4286 hardirqs last enabled at (4285): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (4285): [] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 hardirqs last disabled at (4286): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1100 softirqs last enabled at (4280): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last enabled at (4280): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last enabled at (4280): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 softirqs last disabled at (141): [] invoke_softirq kernel/softirq.c:433 [inline] softirqs last disabled at (141): [] __irq_exit_rcu kernel/softirq.c:637 [inline] softirqs last disabled at (141): [] irq_exit_rcu+0x250/0x2a0 kernel/softirq.c:649 CPU: 0 PID: 7439 Comm: syz-executor.2 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:177 [inline] RIP: 0010:kasan_check_range+0x59/0x180 mm/kasan/generic.c:186 Code: 00 49 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 48 89 e8 49 8d 5a 01 <48> 89 da 48 29 ea 48 83 fa 10 7e 63 41 89 eb 41 83 e3 07 75 74 4c RSP: 0018:ffffc900047c75a0 EFLAGS: 00000286 RAX: ffffed1023650050 RBX: ffffed1023650051 RCX: ffffffff81532cf1 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811b280280 RBP: ffffed1023650050 R08: 0000000000000000 R09: ffff88811b280287 R10: ffffed1023650050 R11: 0000000002e854b7 R12: ffff88811b280280 R13: 0000000000000000 R14: ffffed1023650050 R15: dffffc0000000000 FS: 00007fa693bfb700(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb53ed7a040 CR3: 0000000112f16000 CR4: 0000000000350ef0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] test_ti_thread_flag include/linux/thread_info.h:117 [inline] need_resched include/linux/sched.h:1982 [inline] mutex_spin_on_owner+0xe1/0x320 kernel/locking/mutex.c:568 mutex_optimistic_spin kernel/locking/mutex.c:673 [inline] __mutex_lock_common kernel/locking/mutex.c:1055 [inline] __mutex_lock+0xa47/0x10c0 kernel/locking/mutex.c:1104 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x2e4/0x860 net/core/rtnetlink.c:5559 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2350 ___sys_sendmsg+0xd3/0x150 net/socket.c:2404 __sys_sendmsg+0xb2/0x140 net/socket.c:2433 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa693bfb188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055cf00 RCX: 0000000000465109 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00000000004af711 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055cf00 R13: 00007fff9800c9ff R14: 00007fa693bfb300 R15: 0000000000022000