====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc8-next-20180119+ #101 Not tainted ------------------------------------------------------ syz-executor0/12742 is trying to acquire lock: (&p->lock){+.+.}, at: [<000000008b9e50d1>] seq_read+0xd5/0x13d0 fs/seq_file.c:165 but task is already holding lock: (&sig->cred_guard_mutex){+.+.}, at: [<0000000010e2fcd2>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1390 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:923 lock_trace+0x44/0xc0 fs/proc/base.c:408 proc_pid_syscall+0xa3/0x550 fs/proc/base.c:625 proc_single_show+0xf8/0x170 fs/proc/base.c:747 seq_read+0x385/0x13d0 fs/seq_file.c:234 do_loop_readv_writev fs/read_write.c:673 [inline] do_iter_read+0x3d2/0x5a0 fs/read_write.c:897 vfs_readv+0x121/0x1c0 fs/read_write.c:959 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x508/0xae0 fs/splice.c:416 do_splice_to+0x10a/0x160 fs/splice.c:880 splice_direct_to_actor+0x242/0x820 fs/splice.c:952 do_splice_direct+0x29b/0x3c0 fs/splice.c:1061 do_sendfile+0x5c9/0xe80 fs/read_write.c:1413 SYSC_sendfile64 fs/read_write.c:1468 [inline] SyS_sendfile64+0xbd/0x160 fs/read_write.c:1460 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #0 (&p->lock){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3919 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 seq_read+0xd5/0x13d0 fs/seq_file.c:165 __vfs_read+0xef/0xa00 fs/read_write.c:411 vfs_read+0x11e/0x350 fs/read_write.c:447 kernel_read+0xab/0x120 fs/read_write.c:426 prepare_binprm+0x40d/0x9f0 fs/exec.c:1567 do_execveat_common.isra.30+0x1472/0x22a0 fs/exec.c:1784 do_execve fs/exec.c:1848 [inline] SYSC_execve fs/exec.c:1929 [inline] SyS_execve+0x39/0x50 fs/exec.c:1924 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285 return_from_SYSCALL_64+0x0/0x75 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor0/12742: #0: (&sig->cred_guard_mutex){+.+.}, at: [<0000000010e2fcd2>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1390 stack backtrace: CPU: 1 PID: 12742 Comm: syz-executor0 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1862 [inline] check_prevs_add kernel/locking/lockdep.c:1975 [inline] validate_chain kernel/locking/lockdep.c:2416 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3430 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3919 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 seq_read+0xd5/0x13d0 fs/seq_file.c:165 __vfs_read+0xef/0xa00 fs/read_write.c:411 vfs_read+0x11e/0x350 fs/read_write.c:447 kernel_read+0xab/0x120 fs/read_write.c:426 prepare_binprm+0x40d/0x9f0 fs/exec.c:1567 do_execveat_common.isra.30+0x1472/0x22a0 fs/exec.c:1784 do_execve fs/exec.c:1848 [inline] SYSC_execve fs/exec.c:1929 [inline] SyS_execve+0x39/0x50 fs/exec.c:1924 do_syscall_64+0x273/0x920 arch/x86/entry/common.c:285 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x452e99 RSP: 002b:00007fb1f1581c58 EFLAGS: 00000212 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000002000efe0 RSI: 0000000020008fb8 RDI: 0000000020011000 RBP: 0000000000000070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006eeb20 R13: 00000000ffffffff R14: 00007fb1f15826d4 R15: 0000000000000000 handle_userfault: 47 callbacks suppressed FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 0 PID: 13723 Comm: syz-executor5 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801d5cf7928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 00000000000000c3 RSI: ffffc9000445e000 RDI: ffff8801d5cf7d28 RBP: ffff8801d5cf7a08 R08: 1ffff100380a481a R09: 1ffff1003ab9ef1a R10: ffff8801d5cf7858 R11: ffffffff87f19208 R12: 1ffff1003ab9ef28 R13: ffff8801d5cf79e0 R14: 0000000000000000 R15: ffff8801d5cf7d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007feae3b92c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 00000000000003bb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3a28 R13: 00000000ffffffff R14: 00007feae3b936d4 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 0 PID: 13758 Comm: syz-executor5 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c6a5f928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc9000445e000 RDI: ffff8801c6a5fd28 RBP: ffff8801c6a5fa08 R08: 0000000000000000 R09: 1ffff10038d4bed1 R10: ffff8801c6a5f858 R11: ffff8801c5b7e6d0 R12: 1ffff10038d4bf28 R13: ffff8801c6a5f9e0 R14: 0000000000000000 R15: ffff8801c6a5fd20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007feae3b92c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000062 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee9d0 R13: 00000000ffffffff R14: 00007feae3b936d4 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 0 PID: 13826 Comm: syz-executor0 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c5ac7928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc90001908000 RDI: ffff8801c5ac7d28 RBP: ffff8801c5ac7a08 R08: 0000000000000000 R09: 1ffff10038b58ed1 R10: ffff8801c5ac7858 R11: ffff8801c5ef5c00 R12: 1ffff10038b58f28 R13: ffff8801c5ac79e0 R14: 0000000000000000 R15: ffff8801c5ac7d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007fb1f1581c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000618 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f72e0 R13: 00000000ffffffff R14: 00007fb1f15826d4 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 1 PID: 13853 Comm: syz-executor0 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 FAULT_FLAG_ALLOW_RETRY missing 30 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c824f928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 00000000000000c3 RSI: ffffc90001908000 RDI: ffff8801c824fd28 RBP: ffff8801c824fa08 R08: 1ffff10038440cf2 R09: 1ffff10039049f1a R10: ffff8801c824f858 R11: ffffffff87f19208 R12: 1ffff10039049f28 R13: ffff8801c824f9e0 R14: 0000000000000000 R15: ffff8801c824fd20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007fb1f1581c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bec8 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 000000000071bec8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007fb1f15829c0 R15: 0000000000000000 CPU: 0 PID: 13855 Comm: syz-executor1 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801ca377928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 00000000000000c3 RSI: ffffc9000164f000 RDI: ffff8801ca377d28 RBP: ffff8801ca377a08 R08: 1ffff10038fccdc2 R09: 1ffff1003946ef1a R10: ffff8801ca377858 R11: ffffffff87f19208 R12: 1ffff1003946ef28 R13: ffff8801ca3779e0 R14: 0000000000000000 R15: ffff8801ca377d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007ff025e9ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 00000000000000b3 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef168 R13: 00000000ffffffff R14: 00007ff025e9f6d4 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 0 PID: 13891 Comm: syz-executor5 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801ca377928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 00000000000000c3 RSI: ffffc9000445e000 RDI: ffff8801ca377d28 RBP: ffff8801ca377a08 R08: 1ffff100380a481a R09: 1ffff1003946ef1a R10: ffff8801ca377858 R11: ffffffff87f19208 R12: 1ffff1003946ef28 R13: ffff8801ca3779e0 R14: 0000000000000000 R15: ffff8801ca377d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007feae3b92c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007feae3b93700 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007feae3b939c0 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 1 PID: 13916 Comm: syz-executor5 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 FAULT_FLAG_ALLOW_RETRY missing 30 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c4c97928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc9000445e000 RDI: ffff8801c4c97d28 RBP: ffff8801c4c97a08 R08: 0000000000000000 R09: 1ffff10038992ed1 R10: ffff8801c4c97858 R11: ffff8801c564d6d0 R12: 1ffff10038992f28 R13: ffff8801c4c979e0 R14: 0000000000000000 R15: ffff8801c4c97d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007feae3b92c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007feae3b93700 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007feae3b939c0 R15: 0000000000000000 CPU: 0 PID: 13911 Comm: syz-executor1 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c1bd7928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc9000164f000 RDI: ffff8801c1bd7d28 RBP: ffff8801c1bd7a08 R08: 0000000000000000 R09: 1ffff1003837aed1 R10: ffff8801c1bd7858 R11: ffff8801cdfc61a0 R12: 1ffff1003837af28 R13: ffff8801c1bd79e0 R14: 0000000000000000 R15: ffff8801c1bd7d20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007ff025e9ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000315 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2a98 R13: 00000000ffffffff R14: 00007ff025e9f6d4 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 1 PID: 13945 Comm: syz-executor5 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 FAULT_FLAG_ALLOW_RETRY missing 30 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c357f928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 00000000000000c3 RSI: ffffc9000445e000 RDI: ffff8801c357fd28 RBP: ffff8801c357fa08 R08: 1ffff100380a481a R09: 1ffff100386aff1a R10: ffff8801c357f858 R11: ffffffff87f19208 R12: 1ffff100386aff28 R13: ffff8801c357f9e0 R14: 0000000000000000 R15: ffff8801c357fd20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007feae3b92c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 00000000000003bb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3a28 R13: 00000000ffffffff R14: 00007feae3b936d4 R15: 0000000000000000 CPU: 0 PID: 13948 Comm: syz-executor1 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801c81bf928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc9000164f000 RDI: ffff8801c81bfd28 RBP: ffff8801c81bfa08 R08: 0000000000000000 R09: 1ffff10039037ed1 R10: ffff8801c81bf858 R11: ffff8801be2df1a0 R12: 1ffff10039037f28 R13: ffff8801c81bf9e0 R14: 0000000000000000 R15: ffff8801c81bfd20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452e99 RSP: 002b:00007ff025e9ec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff025e9f700 RCX: 0000000000452e99 RDX: 000000000000001c RSI: 0000000020011fd2 RDI: 0000000000000014 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007ff025e9f9c0 R15: 0000000000000000 FAULT_FLAG_ALLOW_RETRY missing 30 CPU: 1 PID: 13989 Comm: syz-executor1 Not tainted 4.15.0-rc8-next-20180119+ #101 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 handle_userfault+0xbd9/0x2500 fs/userfaultfd.c:430 do_anonymous_page mm/memory.c:3149 [inline] handle_pte_fault mm/memory.c:3963 [inline] __handle_mm_fault+0x32a3/0x3ce0 mm/memory.c:4089 handle_mm_fault+0x38f/0x930 mm/memory.c:4126 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1430 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1505 page_fault+0x2c/0x60 arch/x86/entry/entry_64.S:1260 RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline] RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421 RSP: 0018:ffff8801bdc5f928 EFLAGS: 00010246 RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff825ad721 RDX: 0000000000000100 RSI: ffffc9000164f000 RDI: ffff8801bdc5fd28 RBP: ffff8801bdc5fa08 R08: 0000000000000000 R09: 1ffff10037b8bed1 R10: ffff8801bdc5f858 R11: ffff8801c3353c00 R12: 1ffff10037b8bf28 R13: ffff8801bdc5f9e0 R14: 0000000000000000 R15: ffff8801bdc5fd20 generic_perform_write+0x200/0x600 mm/filemap.c:3128 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x684/0x970 fs/read_write.c:482