bisecting fixing commit since 06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd
building syzkaller on 424dd8e7b52828cad44ce653a5d4ac30670f5e2c
testing commit 06a4ec1d9dc652e17ee3ac2ceb6c7cf6c2b75cdd with gcc (GCC) 8.1.0
kernel signature: f7e5d9d3be443e667c26888124de9061d00ee769ac36c19623f41b434901e2c9
run #0: crashed: INFO: task hung in synchronize_rcu
run #1: crashed: INFO: task hung in synchronize_rcu
run #2: crashed: INFO: task hung in synchronize_rcu
run #3: crashed: INFO: task hung in synchronize_rcu
run #4: crashed: INFO: task hung in synchronize_rcu
run #5: crashed: no output from test machine
run #6: crashed: no output from test machine
run #7: crashed: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
testing current HEAD 7cf726a59435301046250c42131554d9ccc566b8
testing commit 7cf726a59435301046250c42131554d9ccc566b8 with gcc (GCC) 8.1.0
kernel signature: bb37d2d06627d514840f7126f06f195f692a0651efea50ba8434a09bd45fff4d
all runs: crashed: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs_on
revisions tested: 2, total time: 23m5.634907885s (build: 11m21.362436338s, test: 11m2.934558023s)
the crash still happens on HEAD
commit msg: Merge tag 'linux-kselftest-kunit-5.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
crash: BUG: using __this_cpu_read() in preemptible code in trace_hardirqs_on
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.1/8287
caller is lockdep_hardirqs_on_prepare+0x2f/0x1d0 kernel/locking/lockdep.c:4060
CPU: 0 PID: 8287 Comm: syz-executor.1 Not tainted 5.9.0-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+0xa3/0xc8 lib/dump_stack.c:118
 check_preemption_disabled+0xbe/0xd0 lib/smp_processor_id.c:48
 lockdep_hardirqs_on_prepare+0x2f/0x1d0 kernel/locking/lockdep.c:4060
 trace_hardirqs_on+0x1a/0xf0 kernel/trace/trace_preemptirq.c:49
 __bad_area_nosemaphore+0x5e/0x210 arch/x86/mm/fault.c:797
 do_user_addr_fault arch/x86/mm/fault.c:1345 [inline]
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x5e6/0x700 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
RIP: 0033:0x40255b
Code: 40 41 89 e8 4c 89 ef b9 11 80 00 00 c1 e6 04 03 73 64 8d 14 90 39 f2 48 0f 43 f2 45 31 c9 ba 03 00 00 00 e8 f7 ac 05 00 8b 33 <49> 89 07 41 89 e8 4c 89 e7 41 b9 00 00 00 10 b9 11 80 00 00 ba 03
RSP: 002b:00007fa5d32ffc00 EFLAGS: 00010207
RAX: 0000000020ee7000 RBX: 0000000020000080 RCX: 000000000045d28a
RDX: 0000000000000003 RSI: 0000000000008000 RDI: 0000000020ee7000
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020ffd000
R13: 0000000020ee7000 R14: 0000000000000000 R15: 0000000000000000
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.1/8287
caller is lockdep_hardirqs_on+0x34/0x120 kernel/locking/lockdep.c:4129
CPU: 0 PID: 8287 Comm: syz-executor.1 Not tainted 5.9.0-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+0xa3/0xc8 lib/dump_stack.c:118
 check_preemption_disabled+0xbe/0xd0 lib/smp_processor_id.c:48
 lockdep_hardirqs_on+0x34/0x120 kernel/locking/lockdep.c:4129
 __bad_area_nosemaphore+0x5e/0x210 arch/x86/mm/fault.c:797
 do_user_addr_fault arch/x86/mm/fault.c:1345 [inline]
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x5e6/0x700 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
RIP: 0033:0x40255b
Code: 40 41 89 e8 4c 89 ef b9 11 80 00 00 c1 e6 04 03 73 64 8d 14 90 39 f2 48 0f 43 f2 45 31 c9 ba 03 00 00 00 e8 f7 ac 05 00 8b 33 <49> 89 07 41 89 e8 4c 89 e7 41 b9 00 00 00 10 b9 11 80 00 00 ba 03
RSP: 002b:00007fa5d32ffc00 EFLAGS: 00010207
RAX: 0000000020ee7000 RBX: 0000000020000080 RCX: 000000000045d28a
RDX: 0000000000000003 RSI: 0000000000008000 RDI: 0000000020ee7000
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020ffd000
R13: 0000000020ee7000 R14: 0000000000000000 R15: 0000000000000000
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.1/8287
caller is lockdep_hardirqs_on_prepare+0x2f/0x1d0 kernel/locking/lockdep.c:4060
CPU: 1 PID: 8287 Comm: syz-executor.1 Not tainted 5.9.0-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+0xa3/0xc8 lib/dump_stack.c:118
 check_preemption_disabled+0xbe/0xd0 lib/smp_processor_id.c:48
 lockdep_hardirqs_on_prepare+0x2f/0x1d0 kernel/locking/lockdep.c:4060
 trace_hardirqs_on+0x1a/0xf0 kernel/trace/trace_preemptirq.c:49
 __bad_area_nosemaphore+0x5e/0x210 arch/x86/mm/fault.c:797
 do_user_addr_fault arch/x86/mm/fault.c:1345 [inline]
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x5e6/0x700 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
RIP: 0033:0x40255b
Code: 40 41 89 e8 4c 89 ef b9 11 80 00 00 c1 e6 04 03 73 64 8d 14 90 39 f2 48 0f 43 f2 45 31 c9 ba 03 00 00 00 e8 f7 ac 05 00 8b 33 <49> 89 07 41 89 e8 4c 89 e7 41 b9 00 00 00 10 b9 11 80 00 00 ba 03
RSP: 002b:00007fa5d32ffc00 EFLAGS: 00010207
RAX: 0000000020ee7000 RBX: 0000000020000080 RCX: 000000000045d28a
RDX: 0000000000000003 RSI: 0000000000008000 RDI: 0000000020ee7000
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020ffd000
R13: 0000000020ee7000 R14: 0000000000000000 R15: 0000000000000000
BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor.1/8287
caller is lockdep_hardirqs_on+0x34/0x120 kernel/locking/lockdep.c:4129
CPU: 1 PID: 8287 Comm: syz-executor.1 Not tainted 5.9.0-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+0xa3/0xc8 lib/dump_stack.c:118
 check_preemption_disabled+0xbe/0xd0 lib/smp_processor_id.c:48
 lockdep_hardirqs_on+0x34/0x120 kernel/locking/lockdep.c:4129
 __bad_area_nosemaphore+0x5e/0x210 arch/x86/mm/fault.c:797
 do_user_addr_fault arch/x86/mm/fault.c:1345 [inline]
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x5e6/0x700 arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
RIP: 0033:0x40255b
Code: 40 41 89 e8 4c 89 ef b9 11 80 00 00 c1 e6 04 03 73 64 8d 14 90 39 f2 48 0f 43 f2 45 31 c9 ba 03 00 00 00 e8 f7 ac 05 00 8b 33 <49> 89 07 41 89 e8 4c 89 e7 41 b9 00 00 00 10 b9 11 80 00 00 ba 03
RSP: 002b:00007fa5d32ffc00 EFLAGS: 00010207
RAX: 0000000020ee7000 RBX: 0000000020000080 RCX: 000000000045d28a
RDX: 0000000000000003 RSI: 0000000000008000 RDI: 0000000020ee7000
RBP: 0000000000000004 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020ffd000
R13: 0000000020ee7000 R14: 0000000000000000 R15: 0000000000000000